Steps for ridding the country of Illegal Aliens:
1. make it a felony to hire an Illegal Alien
2. make it a felony to sell or rent housing to an Illegal Alien
3. make it a felony to sell or lease a vehicle to an Illegal Alien
4. make it a felony for a bank or other financial institution to open or maintain an account for an Illegal Alien
5. make it a felony to provide an Illegal Alien with money-wire-transfer services
6. make it a felony to provide Currency Exchange -type services for an Illegal Alien
7. make it a felony to provide taxpayer-funded welfare or social services to an Illegal Alien
8. make it a felony to provide educational services to an Illegal Alien
9. make it a felony to provide medical services to an Illegal Alien (except for emergency life-saving or contagion spread-prevention measures)
10. modify all State and Federal drivers licenses and government ID cards to indicate Citizenship status
11. invest heavily in technology infrastructure to make "e-Verify" -like online citizenship verification available more broadly, beyond the realm of pre-employment screening
12. require an e-Verify query for every existing employee currently holding a job in the United States
13. metaphorically-legally "crucify" employers who violate related hiring laws.
14. declare Sanctuary Cities to be engaged in conspiracy to violate US Immigration Law
15. de-fund Sanctuary Cities at the Federal and State level until they rescind their Sanctuary status.
16. arrest the Mayors and City Councils of any Sanctuary Cities that do not rescind Sanctuary status and prosecute and convict them of conspiring to violate US Immigration Law, unless they rescind Sanctuary status
17. put teeth into these laws, to punish violators on a graduated or escalating scale, with chronic offenders getting hammered in criminal court; prison time and huge fines.
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Or some-such more draconian approach, plus or minus a bit, in areas where existing law or judicial rulings or practicalities dictate a tweak here-and-there.
Then watch these Illegal Aliens fall all over each other, scrambling to get the hell out of the United States, at the speed of light, on their own dime, and without the US Government having to spend a single dime on capture and detention and deportation.
A wall isn't the answer. A so-called path-to-citizenship isn't the answer.
Self-Deportation is the answer.
Creating (legal) conditions sufficiently hostile to Illegal Aliens, to make them want to leave, on their own, and to send a clear message across the border, that fun-time is over, and that there's not point in trying, in future.